题解 | #今年的第几天？#

#include <cstdio>

int main(){
    int year,mon,day;
    int totalday[13] = {0};
    int monday[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

    for (int i = 2; i <= 12; ++i) {
        totalday[i] = totalday[i - 1] + monday[i - 1];
    }
     while (scanf("%d%d%d",&year,&mon,&day) != EOF){
         bool isyear = year % 400 == 0 || year % 100 != 0  &&  year % 4 == 0;
         if (isyear == true && mon >= 3){
             printf("%d\n",totalday[mon] + 1 + day);
         } else{
             printf("%d\n",totalday[mon] + day);
         }

     }
}